I've heard of several over the years. One of them had his new at HHK in the Matetsi when I hunted there in 2002 and was happy with it. The main dislike I had to his, was it did not have a wide shallow V in the rear sight, instead had the small square rear notch. I don't temember his name at the moment or the model, but it was the basic model in .470 and all that is required for a PH for a back up rifle. This guy has moved on since to another company - Brent or Brett ?

Some PHs might prefer a Krieghoff for the good reason it can be carried with chambers loaded and uncocked.

Heym is good and marketing the PHs using their rifles and so it works in both directions, clients see the quality Heym rifles and buy them too. Plus the Heym's are generally a superior double rifle to the other two brands mentioned, so if the PH can afford a Heym it makes sense. Plus Heym introduced a DR with less frills and a lower price which is more affordable to PHs, the "PH" model.